Cost and scope
Why a fixed price instead of billing by the hour?
In short and in plain language
You do the same in your own quotes. A price that is only set at the end makes the choice hard.
Then every extra wish leads to an awkward talk. So we set the scope first.
If something is added later, you get a separate fixed price for it. Only then do we begin.
Answer
Because you do the same in your own quotes. A price that is only settled at the end makes the decision hard and turns every additional wish into an awkward discussion. We therefore define the scope beforehand and invoice it. If something is added later that was not in the quote, you receive a separate fixed price for it before we begin.